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scala> import scala.language.experimental._, scala.reflect.macros.blackbox.Context
import scala.language.experimental._
import scala.reflect.macros.blackbox.Context
scala> object GrabContext {
def lastContext = Option(System.getProperties.get("lastContext").asInstanceOf[reflect.macros.runtime.Context])
// System.properties lets you stash true globals (unlike statics which are classloader scoped)
def impl(c: Context)() = { import c.universe._; System.getProperties.put("lastContext", c); c.Expr[Unit](q"()") }
def grab(): Unit = macro impl
}
defined object GrabContext
scala> object Test { class C(implicit a: Any) { GrabContext.grab } }
defined object Test
scala> object Test { class C(implicit a: Any) { GrabContext.grab } }
defined object Test
scala> :quit
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